Laserfiche WebLink
The coal refuse is not expected to contain material that will cause water seeping through the waste <br />to become toxic or acid in nature. For this reason, coal waste and mine development waste can be <br />disposed of together (Rule 4.09.1(12)) and certain requirements regarding coal processing waste <br />banks are not applicable. No treatment of this runoff other than for sediment is anticipated. No sub- <br />drain system will be provided to prevent the surface water or seepage from entering the <br />groundwater system. However, the embankment drainage will be monitored and appropriate <br />measures taken if the water does become toxic or acid. Monitoring will include the sampling of <br />sediment pond discharges (see Hydrology section). If the water does become acid or toxic, the <br />ponds, ditches, and disposal areas will be lined with impervious material and the drainage treated. <br />Coal waste banks already constructed will be modified as directed by the appropriate regulatory <br />agency. <br />The material will be placed and compacted in a maximum of 24-inch lifts. The material will be <br />placed to minimize ponding of surface water on or behind the waste bank. Runoff will be picked up <br />in the diversion ditches located along the toe of the refuse bank where it intersects the original <br />ground. As the refuse bank grows higher, the edges will be sloped back at target of 4(h):1(v) or <br />flatter but with limited areas constructed at up to 3(h):1(v) to provide positive slope stability and <br />minimize slope erosion. <br />• Access will be maintained to sedimentation ponds and ditches for periodic inspection and cleaning <br />as warranted. <br />Once asub-area is declared properly reclaimed, the sedimentation ponds, temporary ditches, and <br />access road will be reclaimed and the permanent diversion ditches will be extended into the natural <br />drainage channels. The reclaimed surtace slopes will minimize ponding even if some settlement <br />should occur. Some surtace retention of precipitation is intended through surface roughening to <br />improve revegetation success and minimize sediment generation. Such surtace retention will not <br />adversely affect stability. The reclamation of sub-areas 1, 2/3/4, and 5a are shown on Maps 77, <br />77A, and 150. <br />More refuse storage area has been provided than is estimated to be necessary. This excess area <br />will be used if refuse volumes are greater than anticipated or the amount of coal eventually mined is <br />greater than now expected. <br />The bank and pond designs for only the first five sub-areas are presented in this application. <br />Designs for the other areas will be prepared and submitted for DMG's approval prior to the opening <br />of these areas. <br />TR60 (7/2004) IV-22 <br />